kivy: tweaks

gui/kivy/uix/ui_screens/amount.kv

@@ -20,6 +20,7 @@ Popup:
                     fiat_text: (kb.fiat_amount + ' ' + app.fiat_unit) if kb.fiat_amount else ''
                     text: (self.fiat_text + ' / ' + self.btc_text if kb.is_fiat else self.btc_text + ' / ' + self.fiat_text) if self.btc_text else ''
                     size_hint: 1, 1
+                    font_size: '22dp'
             Widget:
                 size_hint: 1, 1
             GridLayout:

gui/kivy/uix/ui_screens/password.kv

@@ -1,14 +1,16 @@
 Popup:
     id: popup
     title: _('Enter PIN Code')
+    size_hint: 0.9, 0.9
 
     BoxLayout:
 
         orientation: 'vertical'
+        size_hint: 0.8, 1
 
         Label:
             id: a
-            text: '*'*len(kb.password)
+            text: ' * '*len(kb.password) + ' o '*(6-len(kb.password))
             size_hint: 1, None
             height: '48dp'